Rather than using Google's ID, let's pick an unused one.

We are not reserving an official USB vendor ID, since this is only used
for development and Qt for Device Creation users will use their own USB
IDs in the final devices.

Also always use a fixed product ID, since ADB_PRODUCTID value will make
no sense with the changed vendor ID.

Change-Id: I69ed1bcfbe3e17b5faebf4b3b71f691778776da7
Reviewed-by: Mikko Gronoff <mikko.gronoff@qt.io>
Reviewed-by: Samuli Piippo <samuli.piippo@qt.io>